<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>登陆</title>
        <!--外链式-->
    <link rel="stylesheet" href="css/demo2_css.css">

</head>
<body>

<div class="login" id="login">
    <a href="" class="index">首页</a>
     柠檬班登陆页面

</div>

<form action="" method="post">
    账号：<input type="text" name="user" placeholder="请输入账号"><br>
    密码：<input type="password" name="pwd" placeholder="请输入密码"><br>

</form>

<div>01</div>
<div>02</div>
<div>03</div>
<hr>

<span class="musen">123456</span>
<div class="musen">2345678i</div>

<h1>12345</h1>
<h2>12345</h2>
<h3>12345</h3>
<h4>12345</h4>

</body>
</html>